NUMERICAL CONTROLLER HAVING CORNER PATH GENERATION FUNCTION IN CONSIDERATION OF POST-INTERPOLATION ACCELERATION/DECELERATION

摘要

A numerical controller controls a machine tool with a plurality of control axes so as to compensate an inward turning error by inserting a curved movement path into a corner section between two consecutive blocks. An estimated inward turning amount generated as the corner section is subjected to post-interpolation acceleration/deceleration is calculated based on the radius of curvature of the curve and allowable accelerations of the axes of the machine tool, and such a curved movement path that its inward turning amount has a value obtained by subtracting the estimated inward turning amount from a tolerance is inserted into the corner section if the sum of the estimated inward turning and the inward turning amount of the curve is larger than the tolerance.

主权项

1. A numerical controller which controls a machine tool comprising a plurality of control axes so as to compensate an inward turning error by inserting a curved movement path into a corner section between two consecutive blocks in a machining program comprising a plurality of blocks, the numerical controller comprising:
an allowable inward turning amount setting unit configured to set an allowable inward turning amount generated at the corner section between the blocks; and a corner path generation unit configured to insert the curved movement path with an inward turning amount not larger than the allowable inward turning amount into the corner section between the blocks, wherein the corner path generation unit is configured to calculate an estimated inward turning amount generated as the corner section is subjected to post-interpolation acceleration/deceleration, based on the radius of curvature of the curve and allowable accelerations of the axes of the machine tool, and insert such a curved movement path that the inward turning amount has a value obtained by subtracting the estimated inward turning amount from the allowable inward turning amount into the corner section between the blocks in case where the sum of the inward turning amount of the curve and the estimated inward turning amount is larger than the allowable inward turning amount.